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| 型號(hào)： | MCP3221A6T-E/OT |
| 廠商： | Microchip Technology |
| 文件頁(yè)數(shù)： | 11/28頁(yè) |
| 文件大?。?/td> | 0K |
| 描述： | ADC 12BIT I2C INTERFACE SOT23-5 |
| 標(biāo)準(zhǔn)包裝： | 1 |
| 位數(shù)： | 12 |
| 采樣率（每秒）： | 22.3k |
| 數(shù)據(jù)接口： | I²C，串行 |
| 轉(zhuǎn)換器數(shù)目： | 1 |
| 電壓電源： | 單電源 |
| 工作溫度： | -40°C ~ 125°C |
| 安裝類(lèi)型： | 表面貼裝 |
| 封裝/外殼： | SC-74A，SOT-753 |
| 供應(yīng)商設(shè)備封裝： | SOT-23-5 |
| 包裝： | 標(biāo)準(zhǔn)包裝 |
| 輸入數(shù)目和類(lèi)型： | 1 個(gè)單端，單極 |
| 其它名稱(chēng)： | MCP3221A6T-E/OTDKR |
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2006 Microchip Technology Inc.
DS21732C-page 19
MCP3221
6.3
Device Polling
In some instances, it may be necessary to test for
MCP3221 presence on the I2C bus without performing
a conversion. This operation is described in Figure 6-4.
Here we are setting the R/W bit in the address byte to
a zero. The MCP3221 will then acknowledge by pulling
SDA low during the ACK clock and then release the
bus back to the I2C master. A stop or repeated start bit
can then be issued from the master and I2C
communication can continue.
FIGURE 6-4:
Device Polling.
6.4
Device Power and Layout
Considerations
6.4.1
POWERING THE MCP3221
VDD supplies the power to the device as well as the ref-
erence voltage. A bypass capacitor value of 0.1 F is
recommended. Adding a 10 F capacitor in parallel is
recommended to attenuate higher frequency noise
present in some systems.
FIGURE 6-5:
Powering the MCP3221.
6.4.2
LAYOUT CONSIDERATIONS
When laying out a printed circuit board for use with
analog components, care should be taken to reduce
noise wherever possible. A bypass capacitor from VDD
to ground should always be used with this device and
should be placed as close as possible to the device pin.
A bypass capacitor value of 0.1 F is recommended.
Digital and analog traces should be separated as much
as possible on the board, with no traces running
underneath the device or the bypass capacitor. Extra
precautions should be taken to keep traces with high-
frequency signals (such as clock lines) as far as
possible from analog traces.
Use of an analog ground plane is recommended in
order to keep the ground potential the same for all
devices on the board. Providing VDD connections to
devices in a “star” configuration can also reduce noise
by eliminating current return paths and associated
errors (Figure 6-6). For more information on layout tips
when using the MCP3221 or other ADC devices, refer
to AN688, “Layout Tips for 12-Bit A/D Converter
Applications”.
FIGURE 6-6:
VDD traces arranged in a
‘Star’ configuration in order to reduce errors
caused by current return paths.
6.4.3
USING A REFERENCE FOR
SUPPLY
The MCP3221 uses VDD as both power and a refer-
ence. In some applications, it may be necessary to use
a stable reference to achieve the required accuracy.
Figure 6-7 shows an example using the MCP1541 as a
4.096V, 2% reference.
FIGURE 6-7:
Stable Power and
Reference Configuration.
12 3 4 5 6 7 8 9
SCL
SDA
1 00 1 A2 A1A0 0 ACK
Start
Bit
Address Byte
Address bits
Device bits
R/W
Start
Bit
MCP3221 response
VDD
VDD
AIN
SCL
SDA
To
Microcontroller
10 F
MCP3221
0.1 F
VDD
RPU
VDD
Connection
Device 1
Device 2
Device 3
Device 4
VDD
4.096V
Reference
1F
0.1
F
MCP1541
CL
AIN
To
Mi
cro
con
tr
ol
le
r
MCP3221
VDD
RPU
SCL
SDA
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| MCP3221A7T-E/OT | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 12-bit ADC I2C Single Channel RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 結(jié)構(gòu):Sigma-Delta 轉(zhuǎn)換速率:125 SPs to 8 KSPs 分辨率:24 bit 輸入類(lèi)型:Differential 信噪比:107 dB 接口類(lèi)型:SPI 工作電源電壓:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-32 |
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